Back to worksheetsReasoningAges 7-9
Missing sequence terms
Use the constant step size between terms to find the missing middle number in a sequence. Review suitability for your learners before teaching.
Worksheet StudioPractice pack · Ages 7-9
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 12, 19, ____, 33, 40.
2. Find the missing number in the sequence: 7, 13, ____, 25, 31.
3. Find the missing number in the sequence: 4, 14, ____, 34, 44.
4. Find the missing number in the sequence: 14, 22, ____, 38, 46.
5. Find the missing number in the sequence: 11, 20, ____, 38, 47.
6. Find the missing number in the sequence: 15, 21, ____, 33, 39.
7. Find the missing number in the sequence: 10, 16, ____, 28, 34.
8. Find the missing number in the sequence: 11, 15, ____, 23, 27.
9. Find the missing number in the sequence: 6, 15, ____, 33, 42.
10. Find the missing number in the sequence: 20, 29, ____, 47, 56.
11. Find the missing number in the sequence: 8, 11, ____, 17, 20.
12. Find the missing number in the sequence: 4, 11, ____, 25, 32.
12 questions · Seed 104752 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 12, 19, ____, 33, 40.
26The sequence increases by 7 each step: 19 + 7 = 26.
2. Find the missing number in the sequence: 7, 13, ____, 25, 31.
19The sequence increases by 6 each step: 13 + 6 = 19.
3. Find the missing number in the sequence: 4, 14, ____, 34, 44.
24The sequence increases by 10 each step: 14 + 10 = 24.
4. Find the missing number in the sequence: 14, 22, ____, 38, 46.
30The sequence increases by 8 each step: 22 + 8 = 30.
5. Find the missing number in the sequence: 11, 20, ____, 38, 47.
29The sequence increases by 9 each step: 20 + 9 = 29.
6. Find the missing number in the sequence: 15, 21, ____, 33, 39.
27The sequence increases by 6 each step: 21 + 6 = 27.
7. Find the missing number in the sequence: 10, 16, ____, 28, 34.
22The sequence increases by 6 each step: 16 + 6 = 22.
8. Find the missing number in the sequence: 11, 15, ____, 23, 27.
19The sequence increases by 4 each step: 15 + 4 = 19.
9. Find the missing number in the sequence: 6, 15, ____, 33, 42.
24The sequence increases by 9 each step: 15 + 9 = 24.
10. Find the missing number in the sequence: 20, 29, ____, 47, 56.
38The sequence increases by 9 each step: 29 + 9 = 38.
11. Find the missing number in the sequence: 8, 11, ____, 17, 20.
14The sequence increases by 3 each step: 11 + 3 = 14.
12. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
12 questions · Seed 104752 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 12, 19, ____, 33, 40.
2. Find the missing number in the sequence: 7, 13, ____, 25, 31.
3. Find the missing number in the sequence: 4, 14, ____, 34, 44.
4. Find the missing number in the sequence: 14, 22, ____, 38, 46.
5. Find the missing number in the sequence: 11, 20, ____, 38, 47.
6. Find the missing number in the sequence: 15, 21, ____, 33, 39.
7. Find the missing number in the sequence: 10, 16, ____, 28, 34.
8. Find the missing number in the sequence: 11, 15, ____, 23, 27.
9. Find the missing number in the sequence: 6, 15, ____, 33, 42.
10. Find the missing number in the sequence: 20, 29, ____, 47, 56.
11. Find the missing number in the sequence: 8, 11, ____, 17, 20.
12. Find the missing number in the sequence: 4, 11, ____, 25, 32.
12 questions · Seed 104752 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 12, 19, ____, 33, 40.
26The sequence increases by 7 each step: 19 + 7 = 26.
2. Find the missing number in the sequence: 7, 13, ____, 25, 31.
19The sequence increases by 6 each step: 13 + 6 = 19.
3. Find the missing number in the sequence: 4, 14, ____, 34, 44.
24The sequence increases by 10 each step: 14 + 10 = 24.
4. Find the missing number in the sequence: 14, 22, ____, 38, 46.
30The sequence increases by 8 each step: 22 + 8 = 30.
5. Find the missing number in the sequence: 11, 20, ____, 38, 47.
29The sequence increases by 9 each step: 20 + 9 = 29.
6. Find the missing number in the sequence: 15, 21, ____, 33, 39.
27The sequence increases by 6 each step: 21 + 6 = 27.
7. Find the missing number in the sequence: 10, 16, ____, 28, 34.
22The sequence increases by 6 each step: 16 + 6 = 22.
8. Find the missing number in the sequence: 11, 15, ____, 23, 27.
19The sequence increases by 4 each step: 15 + 4 = 19.
9. Find the missing number in the sequence: 6, 15, ____, 33, 42.
24The sequence increases by 9 each step: 15 + 9 = 24.
10. Find the missing number in the sequence: 20, 29, ____, 47, 56.
38The sequence increases by 9 each step: 29 + 9 = 38.
11. Find the missing number in the sequence: 8, 11, ____, 17, 20.
14The sequence increases by 3 each step: 11 + 3 = 14.
12. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
12 questions · Seed 104752 · Age guidance, not curriculum certification